World Resorts Saint Lucia Castries Weather

Castries 7 Days Forecast

05.09
sat
Day
88°F
W 14 mph
Precip.
15%
Night
82°F
W 12 mph
Precip.
28%
06.09
sun
Day
86°F
W 15 mph
Precip.
5%
Night
82°F
W 15 mph
Precip.
21%
07.09
mon
Day
86°F
W 16 mph
Precip.
4%
Night
82°F
W 17 mph
Precip.
22%
08.09
tue
Day
86°F
W 18 mph
Precip.
15%
Night
81°F
W 15 mph
Precip.
22%
09.09
wed
Day
86°F
W 18 mph
Precip.
15%
Night
81°F
W 16 mph
Precip.
36%
10.09
thu
Day
82°F
W 17 mph
Precip.
36%
Night
81°F
W 17 mph
Precip.
52%
11.09
fri
Day
82°F
W 19 mph
Precip.
65%
Night
79°F
NW 13 mph
Precip.
68%

Sea water temperature in September, °F

Show year:
2025
2024
2023

The average sea water temperature in September of 2025 was 85.5°F. The highest and lowest sea temperatures during the month were 85.8°F and 84.9°F.

Air temperature in Castries, °F

Precipitation total in Castries, in.

* Charts above show average data for the last 3 years.

Best time for vacation in Castries

Sunniest months:
December 4 days
March 4 days
September 4 days
Warmest months:
September 86.8 °F
October 86.0 °F
August 85.7 °F
Warmest sea temp:
September 84.8 °F
October 84.6 °F
August 83.9 °F
Coldest months:
January 81.8 °F
February 81.9 °F
March 82.1 °F
Rainiest months:
August 7 days
October 5 days
September 5 days
Windiest months:
June 15.8 mph
February 15.4 mph
July 15.0 mph

Castries on a weather map

Current weather
04:01
Castries
+81°F
W 7 mph
Feels like: +86°F
Precip.: 17%
Places in Saint Lucia:
Name
°F
Vieux Fort
+81°F
Castries
+81°F
24 Hours Forecast
Castries
Local time: 04:01
September 05, saturday
0600
81°F
NW
9 mph
0900
84°F
W
12 mph
1200
88°F
W
14 mph
1500
86°F
W
13 mph
1800
82°F
W
12 mph
2100
82°F
W
12 mph
September 06, sunday
0000
82°F
W
12 mph
0300
81°F
W
12 mph
Units of measurement: °C / °F